<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let name = '张三'
        let age = '18'
        let allowed = age >= 18 ? 'yes' : 'no'
        console.log(allowed)

    </script>
</body>

</html>